Construction material and process for manufacturing same



Patented Dec. 29, 1925.

mmer PAOLO/MARPILLERO! LORENZd E RENZETTIJAND IV q MARZOLA, OF MILAN,ITALY.

CONSTRUCTION MATERIAL AND PROCESS FOR MANUFACTURING SAME.

ll'o Drawing.

To all whom it may concern:

Be it known that we, PAOLO MARPILLnno, LORENZO LORENZETTI, and IvoMAnzoLA, citizens of the Kingdom of Italy, residing at Milan, Italy,have invented certain new and useful Improvements in ConstructionMaterials and Processes for Manufacturing Same, of which the followingis a specification.

The present invention relates to construction materials consistingessentially of a combination of fibrous substances with a suitablecement, the said fibrous substances being composed of filaments orfibres of any kind which are sufliciently rigid and resisting.

The construction materials thus obtained are very light, porous andconsistent. It is to be noted that the fibres do not serve as a fillingmaterial, but they constitute a reticulated fibrous structure in whichthe cement only serves to give the desired rigidity at the points wherethe individual fibres connect or contact with one another. The strengthof the material, therefore, is not due to the binding cement but to thereticulated fibrous strpgture. As the mixture is formed W1 on anycompression for the urpose of making it compact, the resultmg materialsought to be to a large extent spongy and so constituted that the fibresform as it were small bridges; this effect can be obtained when themixture or paste is carefully made.

The process of manufacture of the materials forming the subject of thepresent invention consists in first of all subjecting the fibroussubstances such as yaw, bggasse o1 sugg lfloane fibre, or Indiawnfibre,w qp d nas r tair jrlne press ni iille.

likeito a cdr nbing operation and then to an operation which makes themnon-combustible, this latter operation consisting in treating them withan approximately 10% solution of mgggesiumsaltsmsodilm ate.

Immedia ely afterwards the fibrous mass is formed into a aste withpowdered ide of magnesium, w ich may bemixed or not with Portland cgmentplamor other suit- 1;

able equivalent substances.

The resulting moist mixture is not coherent and must be placed in mouldsin which it is allowed to set for approximately a Application filedMarch 24, 1924. Serial No. 701,574.

fortnight. It may, however, be taken from the mould after two or threehours, when it has attained the desired consistency and be allowed tocontinue to set in the open air. a

The proportions of the fibrous part of the mixture and the agglomeratingsubstance may vary according to whether it is desired to obtainmaterials which are .merely insulating or materials which offer a highre sistance to compression. These proportions may vary from .07 to 3parts by weight of agglomerating substance to one part of fibrousmaterial.

It will be clear that the proportions mentioned are given by way ofexample and that in practice they may be varied at will to suit theparticular requirements of the case. The specific weight of theresulting materials is kept as a general rule below 800 kg. per cubicmillimeter.

Having now particularly described and ascertained the nature of our saidinvention, and in what manner the same is to be performed, we declarethat what we claim is:

1. A process of manufacturing light, insulating and porous constructionelements, comprising the steps of subjecting a fibrous vegetablesubstance to the action of a fireproofing solution; intimately mixingthe fibrous substance so treated, while still damp, with magnesium oxideand cementitious material to form a damp non-coherent mass; fillingmoulds with the damp mass and then allowing said mass to set at leastpartially and in an uncompressed state in the moulds.

2. A light, insulating and porous moulded construction element,comprising a mass of previously fire-proofed vegetable fibres intimatelymixed with magnesium oxide and cementitious material and then allowed toset at least partially in an uncompressed state in a mould, therebyforming a reticulated fibrous structure which is rendered rigid by thecementitious material at the points where the individual fibres contactwith one another.

In testimony whereof we aflix our signatures.

l ING. PAOLO MARPILLERO.

LORENZO LORENZETTI. IVO MARZOLA.

